code: def _get_reproj_normal_error(self, deg):
      tgt_normal = self._render_normal(self.tgt_mesh, deg)
      src_normal = self._render_normal(self.src_mesh, deg)
  
      error = (
          (src_normal[:, :, :3] - tgt_normal[:, :, :3]) ** 2
      ).mean() * 3
  
      return error, src_normal, tgt_normal
  
file_path: pifuhd/lib/evaluator.py
imports: import trimesh
  import trimesh.proximity
  import trimesh.sample
  import numpy
  import math
  import os
  from PIL import Image
  import argparse
label_desc: Use image node_id 7 for calling the MeshEvaluator obj's underlying member method code with example usage: obj._get_reproj_normal_error(deg) and returns: error,  src_normal,  tgt_normal